A vehicle with an engine has many moving parts -the transmission, wheels and axis, tracks, hinges and chains- all of them mechanisms subject to traction and movement which have to be lubricated to function correctly. In addition, the internal combustion engine needs fuel, and dust accumulates, while dirt forms a part of this mechanical and dynamic context. The range of Engine Effects offers the modeler a series of references to reproduce the fuel stains, the spilled oil (leaving a trail of drops on the vehicle panels and in the dust of the road), the marks left by the oil drums on the floor of the truck, the dirt accumulated in the engine compartment, all these to enhance the realistic aspect of the model.

The stains of gasoline and diesel oil do not have the same color. Diesel Stains reproduces the exact orange shade of this fuel, the streaks, traces and splashes caused by refueling with diesel in the field.